Weibull Statistical Analysis of Strength Fluctuation for Failure Prediction and Structural Durability of Friction Stir Welded Al–Cu Dissimilar Joints Correlated to Metallurgical Bonded Characteristics

Yang, Chih Hai; Jiang, Shiau-Jiun

doi:10.3390/ma12020205

Cited by 23 publications

(16 citation statements)

References 42 publications

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“…There are many studies on the use of friction stir welding (FSW) in this environment [1,2]. FSW produces a small heat-affected zone (HAZ), which creates better mechanical properties in joints [3]. However, the most popular method of joining is still arc welding.…”

Section: Introductionmentioning

confidence: 99%

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

2019

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Thermo-mechanically rolled S460ML steel was chosen for welding in underwater wet welding conditions by covered electrodes. The main aim of this study was to check the weldability for fillet welds in a water environment by controlled thermal severity (CTS) tests and to check the influence of temper bead welding (TBW) on the weldability of the investigated steel. Non-destructive and destructive tests showed that S460ML steel has a high susceptibility to cold cracking. In all joints, hardness in the heat-affected zone (HAZ) was extended to the 400 HV10 values. Microscopic testing showed the presence of microcracks in the HAZ of all welded joints. TBW was chosen as the method to improve the weldability of the investigated steel. This technique allows for the reduction of the maximum hardness in the HAZ below the critical value of 380 HV10, as stated by the EN-ISO 15614-1:2017. It was determined that for S460ML steel, from the point of view of weldability, the pitch between two beads should be in the range 75%–100%. Also, if the pitch between two beads increases, the hardness, grain size, and number of cracks decreases. In all specimens where the hardness of the HAZ was below 380 HV10, there were no microcracks.

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Section: Introductionmentioning

confidence: 99%

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

2019

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“…In this approach, reliability is associated with durability which is also the subject of biomedical materials testing [6,7,[20][21][22][23][24][25][26][27][28]. Reliability of mechanical strength is understood differently [29][30][31][32] than reliability referred to as failure rate during use. According to the definition in [33], "The reliability of an object or element is the ability to transfer loads under specific conditions and over a given period of time while maintaining the required strength".…”

Section: Introductionmentioning

confidence: 99%

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

et al. 2020

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This paper discusses the issues of strength and creep of polymeric materials used in orthodontic appliances. Orthodontic biomechanics is focused on the movement of individual teeth or dental groups as a result of the force applied by orthodontic appliances. Stresses in the construction of functional and biomechanical appliances is generated when using the apparatus in the oral cavity. The orthodontic appliance must maintain its shape and not be damaged during treatment so strength and creep resistance are fundamental properties. It was assumed that the clinical success of orthodontic appliances can be determined by these performance properties. The aim of the work was the experimental assessment of comparative bending strength and creep resistance of selected popular polymer materials used in the production of biomechanical orthodontic appliances. Four commercial materials manufactured by the world class producers were tested: NextDent Ortho Rigid (Vertex-Dental B.V., Soesterberg, The Netherlands) marked as “1A”; Erkocryl (ERKODENT Erich Kopp GmbH, Pfalzgrafenweiler, Germany)-“2A”; Vertex Orthoplast (Vertex Dental B.V.), blue, marked as “3A” and material with the same name as “3A” but orange, marked in the article as “4A”. All the tests were carried out after aging in artificial saliva for 48 h at a temperature of 37 °C. Flexular strength and flexular modulus were made using the three point bending method according to the ISO 178 technical standard. Creep tests were carried out according to the method contained in ISO 899-2. The creep test was carried out in an artificial saliva bath at 37 °C. The creep tests showed significant differences in the strength, modulus and deformability of the tested materials. The strength reliability of the tested materials also varied. The research shows that the 2A material can be used for orthodontic applications in which long-term stresses should be lower than 20 MPa.

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“…However, the performance of a single-metal material is difficult to enhance. In contrast, the connection of dissimilar metals appears to have a good development prospect [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Fracture Behavior of an EBW T2 Copper–45 Steel Joint

Liu

Bao

2019

Materials

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The dissimilar joining of T2 copper to 45 steel was performed by electron beam welding (EBW). Full-strength joints were obtained, and the highest tensile strength was found to be 270 MPa, which is almost equal to the strength of copper. Moreover, the macroscopic morphology of the tensile fracture exhibited an obvious necking phenomenon and features such as dimples, and spherical structures were found via scanning electron microscopy (SEM). These results indicated that the fracture of the T2 copper–45 steel joint is a mixed mode of cleavage and ductile fracture. Meanwhile, the fracture toughness was determined using the small punch test (SPT) with a drop rate of 0.5 mm/min. SEM imaging of the fracture surfaces revealed that the fracture was controlled by microscopic void nucleation and always occurred in the copper-side heat affected zone (HAZ). Finally, mutual verification between the numerical simulation of the finite element and the SPT results confirmed that the fracture first occurred in the copper-side HAZ due to the toughness difference.

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Weibull Statistical Analysis of Strength Fluctuation for Failure Prediction and Structural Durability of Friction Stir Welded Al–Cu Dissimilar Joints Correlated to Metallurgical Bonded Characteristics

Cited by 23 publications

References 42 publications

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

Mechanical Properties and Fracture Behavior of an EBW T2 Copper–45 Steel Joint

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